摘要：
Given an n-ary tree, return the level order traversal of its nodes' values. Nary-Tree input serialization is represented in their level order traversa 阅读全文
摘要：
Imagine you have an array like this (note that the array has duplicates, and includes 0 and k): a = [ 4, 64, 200, 42, 56, 22, 1, 64, 0, 161, 200, 0, 4 阅读全文